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Difference between View and table in sql

... A table contains data, a view is just a SELECT statement which has been saved in the database (more or less, depending on your database). The advantage of a view is that it can join data from several tables thus creating a new view of it. Say you have a database w...
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difference between variables inside and outside of __init__()

... class meta(type): def __new__(cls,name,bases,dicto): # two chars missing in original of next line ... if dicto['class_var'] == 'A': print 'There' class proxyclass(object): class_var = 'A' __metaclass__ = meta ... ... ...
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How to make connection to Postgres via Node.js

...values($1, $2)", ['John', x]); x = x - 1; } var query = client.query("SELECT * FROM junk"); //fired after last row is emitted query.on('row', function(row) { console.log(row); }); query.on('end', function() { client.end(); }); //queries can be executed either via text/parameter val...
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How to generate a simple popup using jQuery

... First the CSS - tweak this however you like: a.selected { background-color:#1F75CC; color:white; z-index:100; } .messagepop { background-color:#FFFFFF; border:1px solid #999999; cursor:default; display:none; margin-top: 15px; position:absolute; text-a...
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Uniq by object attribute in Ruby

What's the most elegant way to select out objects in an array that are unique with respect to one or more attributes? 14 An...
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How to select an element inside “this” in jQuery?

I know can I select an element this way: 2 Answers 2 ...
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App Inventor 2 SQLite 拓展:超流行兼容主流SQL语法的迷你本地数据库引擎 ...

...允许您修改数据库以使其兼容。 此设置会影响各种 Select 方法返回结果行的方式。 当此属性为 false 时,Select 方法返回的列表中的每个元素将是一个简单的值列表,这些值表示为每个匹配行选择的列的值。 当此属性为 true ...
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Recommended SQL database design for tags or tagging [closed]

...ries which you will do: Output all Tags for one Item, draw a Tag-Cloud and select all items for one Tag Title. All Tags for one Item: 3-Table: SELECT Tag.Title FROM Tag JOIN ItemTag ON Tag.TagID = ItemTag.TagID WHERE ItemTag.ItemID = :id 2-Table: SELECT Tag.Title FROM Tag WHERE Tag.Item...
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Determine device (iPhone, iPod Touch) with iOS

..._t size; sysctlbyname("hw.machine", NULL, &size, NULL, 0); char *machine = malloc(size); sysctlbyname("hw.machine", machine, &size, NULL, 0); NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding]; free(machine); if ([platf...
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How to return raw string with ApiController?

... Just return Ok(value) won't work, it will be treated as IEnumerable<char>. Instead use return Ok(new { Value = value }) or simillar. share | improve this answer | ...